Description TrueAlarm photoelectric smoke sensing and heat sensing combined in one housing to provide:  Smoke activity accurately monitored by TrueAlarm photoelectric sensing technology  Thermal activity accurately monitored by TrueAlarm thermistor sensing technology  And TrueSense detection, a correlation of smoke activity and thermal activity providing intelligent fire detection earlier than with either        activity alone  For use with Simplex® 4007ES, 4010ES, 4100ES, and 4100U fire alarm control panels:  TrueAlarm analog sensor information is digitally communicated to the control panel via IDNet two-wire communications  Special point types allow the 4098-9754 multi-sensor to communicate smoke and heat analog sensing data using only one IDNet address   Individual sensor information is processed by the host control panel to determine sensor status and to determine whether conditions are normal, off-normal, or alarm Specifications Smoke detection with selectable sensitivity from 0.2 to 3.7 %/ft obscuration Heat detection selectable as fixed temperature or fixed with selectable rate-of-rise TrueSense intelligent analysis of the combination of smoke and heat activity Additional design features: Functional and architecturally styled enclosures for ceiling or wall mounting Smoke sensor louver design that directs air flow to chamber enhancing smoke capture Built-in magnetic test feature  Compatible with standard bases (including relay control), sounder bases, and isolator bases Designed for EMI compatibility